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index.test.ts
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index.test.ts
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import {
initTestUtils,
cleanup,
getRawImage,
writeTmpBuffer,
getFileSize,
getImageMetadata,
} from '@wasm-codecs/test-utils';
import encode from '../lib';
import { ColorSpace } from '../lib/colorspace';
describe('mozjpeg', () => {
beforeAll(() => {
initTestUtils(__dirname);
});
afterAll(cleanup);
// test all image sizes
['tiny', 'small', 'medium', 'large'].forEach((size) => {
it(`encodes a ${size} image`, async () => {
const {
data,
info: { width, height, channels },
} = await getRawImage(`images/${size}.jpg`);
const originalSize = getFileSize(`images/${size}.jpg`);
const originalMetadata = await getImageMetadata(`images/${size}.jpg`);
expect(originalMetadata.channels).toBe(3);
const result = await encode(data, { width, height, channels });
const encodedPath = writeTmpBuffer(result, `${size}.jpg`);
const encodedSize = getFileSize(encodedPath);
// expect the image size to be between 1/4 and 3/4 of the original image
expect(encodedSize).toBeLessThan(originalSize * 0.75);
expect(encodedSize).toBeGreaterThan(originalSize * 0.25);
// check if the image is still a valid jpeg image
const metadata = await getImageMetadata(encodedPath);
expect(metadata.format).toBe('jpeg');
expect(metadata.width).toBe(width);
expect(metadata.height).toBe(height);
expect(metadata.channels).toBe(3);
expect(metadata.isProgressive).toBe(true);
});
});
it('encodes a grayscale image', async () => {
const {
data,
info: { width, height, channels },
} = await getRawImage('images/grayscale.jpg');
const originalSize = getFileSize('images/grayscale.jpg');
const originalMetadata = await getImageMetadata('images/grayscale.jpg');
expect(originalMetadata.channels).toBe(1);
const result = await encode(data, { width, height, channels });
const encodedPath = writeTmpBuffer(result, 'grayscale.jpg');
const encodedSize = getFileSize(encodedPath);
// expect the image size to be between 1/4 and 3/4 of the original image
expect(encodedSize).toBeLessThan(originalSize * 0.75);
expect(encodedSize).toBeGreaterThan(originalSize * 0.25);
// check if the image is still a valid jpeg image
const metadata = await getImageMetadata(encodedPath);
expect(metadata.format).toBe('jpeg');
expect(metadata.width).toBe(width);
expect(metadata.height).toBe(height);
expect(metadata.channels).toBe(1);
});
it('respects quality option', async () => {
const {
data,
info: { width, height, channels },
} = await getRawImage('images/medium.jpg');
const originalSize = getFileSize('images/medium.jpg');
const originalMetadata = await getImageMetadata('images/medium.jpg');
expect(originalMetadata.channels).toBe(3);
const result = await encode(data, { width, height, channels }, { quality: 10 });
const encodedPath = writeTmpBuffer(result, 'medium-lowquality.jpg');
const encodedSize = getFileSize(encodedPath);
// expect the image size to be lower than 10% of the original
expect(encodedSize).toBeLessThan(originalSize * 0.1);
expect(encodedSize).toBeGreaterThan(originalSize * 0.01);
// check if the image is still a valid jpeg image
const metadata = await getImageMetadata(encodedPath);
expect(metadata.format).toBe('jpeg');
expect(metadata.width).toBe(width);
expect(metadata.height).toBe(height);
expect(metadata.channels).toBe(3);
});
it('converts an image into grayscale', async () => {
const {
data,
info: { width, height, channels },
} = await getRawImage('images/medium.jpg');
const originalSize = getFileSize('images/medium.jpg');
const originalMetadata = await getImageMetadata('images/medium.jpg');
expect(originalMetadata.channels).toBe(3);
const result = await encode(data, { width, height, channels }, { colorSpace: ColorSpace.GRAYSCALE });
const encodedPath = writeTmpBuffer(result, 'medium-grayscale.jpg');
const encodedSize = getFileSize(encodedPath);
// expect the image size to be between 1/4 and 3/4 of the original image
expect(encodedSize).toBeLessThan(originalSize * 0.75);
expect(encodedSize).toBeGreaterThan(originalSize * 0.25);
// check if the image is still a valid jpeg image
const metadata = await getImageMetadata(encodedPath);
expect(metadata.format).toBe('jpeg');
expect(metadata.width).toBe(width);
expect(metadata.height).toBe(height);
expect(metadata.channels).toBe(1);
});
it('uses baseline if progressive is disabled', async () => {
const {
data,
info: { width, height, channels },
} = await getRawImage('images/medium.jpg');
const originalSize = getFileSize('images/medium.jpg');
const originalMetadata = await getImageMetadata('images/medium.jpg');
expect(originalMetadata.channels).toBe(3);
const result = await encode(data, { width, height, channels }, { progressive: false });
const encodedPath = writeTmpBuffer(result, 'medium-baseline.jpg');
const encodedSize = getFileSize(encodedPath);
// expect the image size to be between 1/4 and 3/4 of the original image
expect(encodedSize).toBeLessThan(originalSize * 0.75);
expect(encodedSize).toBeGreaterThan(originalSize * 0.25);
// check if the image is still a valid jpeg image
const metadata = await getImageMetadata(encodedPath);
expect(metadata.format).toBe('jpeg');
expect(metadata.width).toBe(width);
expect(metadata.height).toBe(height);
expect(metadata.channels).toBe(3);
expect(metadata.isProgressive).toBe(false);
});
});